Dynamometer



(NoModeL) A. H. EMERY.

DYNAMOMETER.

No. 278,912. Patented June 5,1883.

FIG/I29 N Prrzns Photo-Lxlhogmpher. Wnshinglon, nc.

UNITED, STATES PATENT OFFICE,

ALBERT H.El\IER-Y, OF NET" YORK, N. Y. ASSIGNOR TO THE EMERY SCALE COMPANY, OF STAMFORD, CONNECTICUT.

QDYNAMOMETER.

To all whom it may concern:

Be it known that l, ALBERT H. EMERY, of the city, county, and State of New York, have invented certain new and useful Improvements in Dynamometers, of which the following is a specification.

This instrument is constructed with a suspension stem and beam connected by rods extending down through a case of cylindrical or other form to a load-beam. The load is applied preferably to a stem swiveled in a pair of cross-heads, between which is interposed a buflerspring. Said cross-heads are connected to the case by fixingstuds. The load is transmitted from the case to a pressure-column on the load-beam of the suspension-yoke through the medium of the fulcrum attachment-s of a load-lever connected by one or more secondary levers with a resisting-spring to take up the pressure and a rotary indicator to. show the extent and value of the deflection of the levers produced by the load. The double levers transmit the pressure centrally of the case, so as to entirely obviate any lateral strain. The base of the column upon which the pressure of the load-levers is sustained is connected to the load-beam, and is preferablyflanged to form a stop-plate to limit the movement of the parts by contact with a part of the case. 0 pension and load beams are stayed against motion transversely to the load strain by means of flexible amiular fixingplates applied at the extremities of the case. The intermediate lever of the system connects by a flexible trans 3 5 mitting-plate with the heel or fulcrum-block of the final lever, said fulcrum-block being con nected to the case by vertical and horizontal flexible plates, which respectively suspend it and stay it against horizontal motion. Motion is transmitted from the free end of. the final lever to a rotary indicator by means of aband attached at one end to the extremity of the lever, and at the other end coiled on a drumon the indicator-shait.

In the accompanying drawings the inven tion is represented by three views, numbered 129 to 131, inclusive. Figure 129 is a front elevation of the instrument. Fig. 130 is a vertical section thereof. i Fig. 131 is aview of the. 50 lower end on a smaller scale.

The following p arts are substantially similar The sus- SPECIFICATION forming part of Letters Patent No. 278,912, dated J'une5, 1883.

' Application filed February 5 1881.

(N0 model.)

in construction and operation to parts indicated by corresponding numbers in another application of even date with this, which describes theirapplication to a dynamometer of greater capacity, constructed with li qui d-pressure chambers, the suspensi on-stem 901, suspen sionbean1 902, case 903, fixing-plates 904 and 909, suspending-rods 905, lock-nuts 906, loadbeam 907, clamp-nuts 908, easing-ring 910, nut 916, washer 917, pin 91S, screw 920, packingrings 926, upper part of pressure-colu1nn 928,, screws 929, fastening fulcrum-block 930, transmitting-plate 932, load-lever 933, fulcrum-plate 934, clamp plate and screw 935, transmittingplate 936, clamping plate and screw 93'? 938, thin plates 939 939, clamping plates 940, clamp-connections 941 941, load-lever 942, ingand resisting spring 943, clamping plates and screws 944, clamp 945, temperature-spring 946, clamp plates 947, temperature and adjusting rod 948, transihitting-plate'949, clamp 950, fulcrum-block 951, clamp 952, transmitting-lever 953, screws 954 954, fulcrum-plate 955, bracket 956, plate and screw 957, screw 958, flexible fixing-plate 959, clamp-plates 960 961 963, band 962, drum 964, indicator-shaft 965, indicator 966, brackets 967 968, hairspring 969, pin 969, dial 970, door-frame 97], glass 972, stop-studs 976 97 7 The suspension-stem 901 is secured by locknuts 906 to the suspension-beam 902, inwhich are fixed suspending and connecting rods 905. These rods are formed with shoulders, against which is rigidly clamped, by means of nuts 908, the load-beam 907. The base 979 of the pressure-column is fixed to the load-beam 907 by a screw, 920, and is flanged, as shown, constituting a stop-plate to limit, by contact with the casing-ring 910, the upward movement of the case relatively to the suspension-yoke when relieved of a load. The suspending beam 902 is fixed against lateral. motion by the flexible annular plate 904. The load-beam 907 is fixed to the case 903 and ring 910 and se cured against lateral motion by the flexible annular plate 909. These fixing-plates 904 and 909 may be secured at their edges, as shown in 'Fig. 130, and more specifically described in other applications. The load-stem 984 is pref-- erably swiveled within a moving cross-head, 980, being supported thereon by a nut, 916,

and washer, 917, locked together by a pin, 91b. The moving crosshead 980 rests on a spring, 981, of rubber or other material, bearing on the load cross-head 983, which is rigidly connected by nuts 985 and fixingstuds 982 to the case 903. Instead of the compression spring 981, a tension-spriug of any suitable material may be placed below the cross-head 982i, and in this case the moving cross-head 980 may be dispensed with. The .load which is thus applied to the case 903 is transmitted to the )ressure-eolumn 928979 and load beam 907 through the medium of the t'uhrrum-bracket 9:30, llexible llll('llllll])l2lle 934, and the 'lulcrum-block ot a double or skeleton lever, 933, constituting the primary load-lever, and conneeted by the flexible lln-ust-plate 932 and clamp 93.1. to the upper part, 928, ol" the press ure column. lever 99;} consists .ol two parallel bars connected at their extremities, and may be made in one piece, as shown in Fig. 130. llt is cou nected by the flexible plate 95% and clamp plate and screw 935 to the l'ulcruurbracket 9.30, the latter being secured by screws 929 to the case 903. From the rimar load-lever 933:3 pressure is transmittal, through a llexible plate, 936, (held by clamps 9:37 938,) to a second double or skeletonlever, 9+2, t'ulcrumed by a compoundtlcxible joint constituted oilthiu plates 939 939 and clamps 9 .0. A. clamp, 94:1, lixes the plate 939to thetrausinitting-lcver 942, and a clamp, 941, lixes the plate 939 to the case or to a suitable bracket attached thereto. One or more flexible plates, 943, 'lastened by an adjustable clamp or clamps, 94st, to the lid- (rum-bracket 930, and by a clamp or clamps, 94-5, to the lever 9+2, constitute springs torcsist the deflection ot'the levers under pressure o'l" a load and also to stay the lever 9t2 against horizontal movement.

94,6 represents atcmperat ure-spri ng, fastened to the back part of the lever 94-2 by a clamp plate, 9&7, and to the case by a temperature and adjusting rod, 948, which is formed wholly or in part of metal. more or less cxpansible than that otthe case, in order to counteract automatieall y the effect of changes in temperat ure, as may be necessary. The rod 94s screwed within the case, as shown in. dotted lines, Fig. 129, so that it may be set up or down to vary the pressure of the spring on the lever and .to set the rotary indicator. A ltexi ble transmitting-plate, 949, is fastened by a clamp, 950, to the free end olthe transmitting lever 9-1 2, and by a clamp, 952, to the fulcrumblock 951 of a tiransmitting-lever, 953, which is fixed to the said fulcru.m-l. lock by screws 95l. The lulm'um-block 951 is suspended by a flexible plate, 955, to a bracket, 956, attached to a lug, 986, on the case 903, and forming also the attachment for the flexible :lixing plate or plates 959, by which the said fulcrum-block is secured against horizontal motion. The l'ul crum-platc 955 is clamped to the fulcrum-block 951 by screws 954 954, and to the bracket 956 by clamp 957. The horizontal fixing plate or,

The double or skeleton load plates 959 are attached to the fulcrum-block 951 by clamp 960, and to the bracket 956 by clamp 96].. The use of the bracket is bencli cial in enabling the attaching of the flexible plates to the said bracket and to the fulcrumblock before inserting the whole inv the case, after which the setting and securing ol' the bracket are readily elt'ect ed. The fixing-spring 959 may be attached directly to a lug on the case 903, if preferred. The l'ulcrunrblock or heel-piece 951 is so constructed that the free part of the fulcrum plate or plates {ll-9, or the part exposed to tlexure, reaches above the lower flexible part of the fulcrum plate or plates 955. This construction tends to increase the fulcrum distance between the plates 9-l-9 and 955 as the lever 953 rises. This tends to hasten the rotation of the indicator, which is retarded by other increasing resistances. To the free end of the lever 953.3 is secured adjustably by a clamp, 969, one vend ol' a metallic band, 962, the other extremity of which is coiled on a drum, 964,011 the shalt 965 of the indicator 966. To the shalt is also lixed one end. of a hair-s )ring, 969, coiled in the opposite direc tion .l'rom the band 962, and attached at its other end to a pin, 969, lixed in the load-levtu' 942. The hair'spring works in opposition to the band 962, so as to restore the indicator to zero and keep the parts taut. The double or skeleton levers enable the use ol'transmittingplates made wide for strength and thin. for flexibility. By applying the strainscentrally within said skeleton levers, lateral or oblique strains are avoided and the accuracy and durability of the instrument are greatly enhanced.

'Whatcver novel subject-matter l have set l'orth and not claimed or attempted to claim herein 1 have claimed or attempted to claim in other applications or have reserved to be claimed in future original applicatitms.

The following is here claimed as new:

.1. The combination of the beam 902, con

necting-rods 905, and double balancingdevers 933 and 942, substantially as and for the purposes set forth.

2. The con'lbination ol. the load-beam 907, connet'sting-rods 905, beam 902, one or more load-levers, 933 94-2, and case 903, substanti all y as and for the purposes set fort-h.

u. The COIIlblllttlZlOll of the load-beam 907,

' colunurbase 979, pressure-column 92S, trans i'nittingplate 932, and load lever 933-3.

4. The combination of the load-beam 907, screw 920, pressurecolumn 92S, and the press urecoltunn. base 979, constructed to operate as a stop plate in the manner described.

The COlIlblllflUOll of the pressure-column 928, pressure-column base 979, screw 920, load-beam 907, flexible fixing-plate 909, easing-ring 910, and case 903, as set forth.

6. The combination of the case 909, fixing studs 982, load cross-head 983, spring 981, and moving cross-head 980 with a suitable load attachment.

7. The combination of the suspending-beam 902, connecting-rods 905, load-beam 907, casingring 910, case 903, fixing-studs 982, load and 959, and with the fulcrum-block 951 of the cross-head 983, and spring or springs 981 with lever 953. a suitable load attachment. 10. The combination of the flexible fixing 8. A spring interposed between the load atplate 959, fulcrum-block 951, transmitting-le- 5 tachinent and the load oross-head 983, to re- Ver 953, band 962, drum 964, and indicator- 15 lieve the instrument of shock and transmit shaft 965.

the pressure of the load to the weighing appa- ALBERT H. EMERY. ratus'. \Vitnesses:

9. The combination of the attaching-bracket OOTAVIUS KNIGHT,

I0 956 and lug 986- with the flexible plates 955 \VALTER ALLEN. 

